Cash Register Implementation - Ryan Esquino

[resquino88]

• Implements a full-stack cash register change calculator with an ASP.NET Core 10 REST API and a React + TypeScript frontend
• API accepts a transaction file upload plus a country/currency selection, runs a configurable rule engine to compute minimum-denomination change, and streams the result back as a downloadable text file
• Special rule: when the owed amount is divisible by 3, denominations are randomly allocated (total still correct)
• Frontend lets users upload a file, pick a country/currency from dropdowns, and download the output — with loading and error states handled
• Both layers are fully unit tested (NUnit + Moq on the API side; Vitest + React Testing Library on the frontend)

The README.md files within /api and /web_app outline the setup instructions needed to run the solution. A CLAUDE.md file exists as well for developers that want to make use of Claude AI while developing.